End of Chapter 2:25
Vayihyu sh'neihem "Arumim"
Beginning of chapter 3:1 "v'haNachash hayah "Arum"
Of course the words convey different meanings, the former "nakedness" the latter "cunning." Nevertheless the [apparently] common root - juxtaposed so closely together - seems to be an obvious literary device.
NB: While R. Hirsch does indeed mention "Eryeh" in conjunction with the earlier term "Arumim", he does not seem to focus upon that definition.. Yet Arayot - as in "Giluy Arayot" - seems to be the obvious focus of the Nahash's meddling into Havvah's business. And this is so indicated by the Midrash.